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There were three problems with the sslnegotiation options: 1. The sslmode=prefer and sslnegotiation=requiredirect combination was somewhat dangerous, as you might unintentionally fall back to plaintext authentication when connecting to a pre-v17 server. 2. There was an asymmetry between 'postgres' and 'direct' options. 'postgres' meant "try only traditional negotiation", while 'direct' meant "try direct first, and fall back to traditional negotiation if it fails". That was apparent only if you knew that the 'requiredirect' mode also exists. 3. The "require" word in 'requiredirect' suggests that it's somehow more strict or more secure, similar to sslmode. However, I don't consider direct SSL connections to be a security feature. To address these problems: - Only allow sslnegotiation='direct' if sslmode='require' or stronger. And for the record, Jacob and Robert felt that we should do that (or have sslnegotiation='direct' imply sslmode='require') anyway, regardless of the first issue. - Remove the 'direct' mode that falls back to traditional negotiation, and rename what was called 'requiredirect' to 'direct' instead. In other words, there is no "try both methods" option anymore, 'postgres' now means the traditional negotiation and 'direct' means a direct SSL connection. Reviewed-by: Jelte Fennema-Nio, Robert Haas, Jacob Champion Discussion: https://www.postgresql.org/message-id/d3b1608a-a1b6-4eda-9ec5-ddb3e4375808%40iki.fi
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.